later, new mexico governor susanna martinez campaigns for mitch romney in nevada. -- mitt romney in nevada. >> this week, evan thomas discusses his narrative, "ike's bluff." >> evan thomas, author of "ike's bluff." discussion throughout the entire book, ike's health. why? >> he had a stroke. he had a stomach operation. he was old. he was at the time the oldest president ever. he smoked four packs a day up until 1949. his health was not great. he was a robust man, but an old man with serious health issues. they got to him. >> dr. snyder. >> he was his personal doctor. he seemed to be at the white house 24-7. he kept a diary. they feared if ike got to tents and to worry, he would have another heart attack. he said, mr. president, you have to relax. he would say, what you think this job is? of course he was worried. that was a constant theme. >> who was howard snyder? >> he was his personal doctor, older, an army surgeon. it was happenstance he became a doctor. he was not properly trained. he misdiagnosed ike's heart attack. ike could have died in 1955. he was a good, old fashioned general pr